And john barnes



2 (No Model.)

A. HOLMGREN.

CYLINDER AND VALVE FOR STEAM MOTURS. No. 528,227. Patented Oct. 30, 1894.

, 5 I if A fl n x a F 6 F! i 5 L C D C1 1 A I! a Z 65 1 2377, 055 65. T .fmz araor Lwi'izey" UNITED STATES PATE T .rtrcn...

ALFRED .HOLMGREN, or new YORK, N. Y., ASSIGN-OR or 'lWO-THIRDS To JOHN DRAPER, F WILMINGTON, DELAWARE, AND. JOHN BARNES, or

BROOKLYN, NEW YORK.

CYLINDER AND VALVE FOR creamorons.

SPECIFICATION forming part of Letters Patent No. 528,227, dated October 30, 189%. Application filed October 3, 1893. Serial No. 487,096- (N0 model.) Patented in England December 19, 1892, No- 23,9 83.

To all whom, it may concern:

Be it known that I, ALFRED HOLMGREN, a citizen of the United States of America, residing at New York, in the State of New York,

5 have invented new Improvements in Cylinders and Valvesof Steam, Compressed-Air,

and other Reciprocating Motors, (for which Ihave obtained a patent in Great Britain, No. 23,383, hearing date December 19, 1892,)

1c of which the following is a. specification;

The object ,of this invention is to simplify the construction of the cylinders of steam and other reciprocating engines in such a way that while the ports for the induction and I 5 eduction of the motive fluid are reduced toa minimum, and at the same time the valve for governing the supply andexhaust is also con siderably simplified, and its action rendered much more efficient, such valve shall be per 7 2o fectly balanced and its'construction and arrangement be such that a steam jacket will be provided for the motor cylinder, which jacket willalways be independent of the exhaust and supply of the motive fluid, so that 2 5 the cylinder will be continuously heated and maintained at a uniform temperature, thus avoiding condensation. For this purpose I construct each of the cylinders of the motor so that same are double, that is to say that each consists of two cylinders one within the other, and it is in the annular space between these two cylinders that the valve for controlling the ports at the opposite ends of the cylinder works. The two cylinders have a head common to both at each end, and ator near each end of the inner cylinder aport is formed by simplycutting the wall of the cylinder away all round, simply suitable intervalsto connect the two parts of the inner cylinder together. The partoftho space between the inner and outer cylinders over the port at each end is turned to form a valve cylinder, and in this cylinder the valve (whichis of annular form) reciprocates. The

V two valves for governing theopposite ports are connected by an annular shelhflso as to separate the annular space between the two cylinders into two parts, the inner one serving as a steam jacket for the inside cylinder (for which purpose suitable steam inlet and leaving sufficient metal at outlet openings will be formed through the heads of the cylinders and leading into such annular space), while the outer space will serve either as the steam chest or as the" exhaust common to'both cylinder ports. Passages are formed through each valve into'the outer annular space, so as to connectthe cylinder. ports with the latterat the required times. From oneend of' the valve, spindles Work through glandsat diametricallyopposite points of the cylinder head, and are actuated simultaneously by any suitable means, such as a iorked lever engaging both spindles and caused to rock in any suitable manner so as to actuate the valves at the required times: Any form of expansion gear maybe fitted to the valve sojas .to regulate. the cut off as desired.

By the construction of cylinder and valve described the valve will be relieved of all pressure, and will be perfectly balanced,'and

further, the admission and exhaust of the motive fluid will be perfectly free and unobstructed. a i

In the accompanying drawingsz-Figure l is a longitudinal section of a cylinder and valves constructed according to my invention. Fig. 2 is a side elevation (partly in sec tion) of the valves. Fig. 3 is a transverse section through the valves on the line a, b, Fig. 2, and Fig. 4 is a diagrammatic view showing how the valves may be actuated.

In the drawings A is the inner motor'cylinder, and A the outer motor cylinder, these cylinders being provided with beads C, C, common to both, and the piston rod of piston D, which reciprocates in the inner cylinder A, works through a gland or stulfing box E in the head 0', in the usual manner.

The inner cylinder A is provided with ports F, F, ateach end, which are formed through such cylinder all round,and which are con trolled by the valves 8, B. These valves B, B, are connected togetherv by an annular shell 11, so that such shell divides the space 95 between the cylinders A, A, into two parts a, c, the former of which serves either for supply or exhaust, while the latter forms a jacket through which steam can be causedto circulate by means of passages c c pro I00 vided in the cylinder heads 0,0, and the inner cylinder A, the metal left between the 'ports F, F, respectively, of which, must at one point be sufficient to permit of'the formation of such passages a a through such metal.

The valves B, B, are provided with passages b b through same all round, so as to place the ports F, F, alternately in connection with the space a, serving for supply or exhaust (as the case may be), when such valves are in the requisite position. This annular space. a is permanently open to exhaust or supply (as the case maybe) through the pipe G, while passages H, H, formed through the outer cylinder A, open into the space in which the valves B, B, reciprocate, and are controlled by such valves,so as to alternately'connect the ports F, F, respectively, with the annular space a,and with the passages H, H, the action being such that when port F is in connection with space a, the port F is in connection with passage H, and when port F is in connection with passage H, port F is in connection with space a. If space a serves as an exhaust space, the passages H, H, will serve for the supply, and vice versa.

From opposite sides of the valve B, spindles I, 1', project, and work through stufling boxes or glands in the cylinder head 0', and same are caused to reciprocate by any suitable means, such as by an eccentric K (as shown diagrammatically in Fig. 4), the rodk of which actuatesa rockinglever L, with arms Z, Z, connected respectively to one of the valve spindles 1,1. 4

Itwill be seen that the action oflive. steam entering by passage a and passing through the space a between the shell b of the valve and the inner motor cylinder A, and then leaving by passage a will have the eflect of heating such cylinder, and avoiding condensation.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination with motor cylinders formed with double walls and an annular space between such walls, of. ports formed through the inner wall of such cylinders and controlled byannular valves which are caused to' reciprocate in the space between such walls, the valves at the opposite ends of the cylinder being connected together-by an annular shell dividing the space between the walls of the cylinder into two parts, the inner one of which serves as a steam jacket, while the outer one is by means of passages through each valve placed alternately into communication with the opposite ends of the inside of the cylinder.

ALFRED HOLMGREN.

W'itnesses:

- J OH.- ALF. JOHNSON,

CHAS. SCHAEFER. 

